<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8" />
		<title>Document</title>
	</head>
	<body>
		<script type="text/javascript" >
			let a = 'name'

			let obj = {} // {name:'tom'}
			obj[a] = 'tom'
			console.log(obj);
			
		</script>
	</body>
</html>